摘要
用环-块摩擦磨损试验机在室温下研究了莫来石弥散钇稳定四方氧化锫多晶陶瓷(mullite dispersed yttria stabillizedtetragonal zirconiapolycrystal,MDZ)与高铬铸铁(high chromium cast iron,HCCI)摩擦副在2%(质量分数)SiO2磨粒的5%NaOH溶液中的摩擦磨损性能。结果表明:载荷在100-500 N范围内,含15%(质量分数,下同)莫来石的15 MDZ复合陶瓷的耐磨性明显优于20 MDZ(含有20%莫来石)。载荷500 N下,虽然3Y-TZP(yttria stabillized tetragonal zirconia polycrystal,含3%摩尔分数氧化钇)中弥散15%莫来石后力学性能下降,但耐磨性提高。柱状莫来石对耐磨性的主要贡献是:具有承载作用;阻碍裂纹扩展}折断的柱状莫来石的“滚针轴承”作用减轻磨擦副之间的摩擦磨损。MDZ复合陶瓷的主要磨损机制为微观犁削和柱状莫来石晶粒脱落。
Using a block-on-ring tribometer with revolving motion of high chromium cast iron(HCCI) ring against mullite dispersed yttria stabilized tetragonal zirconia polycrystal (MDZ) blocks, the friction and wear of MDZ were investigated at room temperature in 5% NaOH solution containing 2% (in mass fraction) SiO2 abrasive particles. The results indicate that the wear resistance of 15 MDZ with 15% (in mass) mullite is better than that of 20 MDZ with 20% mullite under the normal load from 100 N to 500 N. The mechanical properties are decreased but the wear resistance is enhanced by dispersing 15% (in mass fraction) mullite in 3Y - TZP( yttria stabilized tetragonal zirconia polycrystal with 3% in mole yttria) (15 MDZ). The main effects of rod-like mullite on the wear resistance are to bear load, restrain the propagation of the preexisted cracks, and reduce the friction and wear due to the action of 'needle roller bearing' from the fractured rod-like mullite. The main wear mechanism of MDZ ceramics is microploughing and pulling-out of rod-like mullite grain.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第2期213-216,共4页
Journal of The Chinese Ceramic Society
基金
十.五
863计划(2002A33082)资助项目
关键词
氧化钇稳定四方氧化锆多晶体
莫来石
复合陶瓷
摩擦磨损
yttria stabillized tetragonal zirconia polycrystal
mullite
composite ceramic
friction wear